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Finding the Fourth Proportional to 90,813.70, 136,220.55 and 81,628.30

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Solution

The fourth proportional to 90,813.70, 136,220.55 and 81,628.30 is: 122,442.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,813.70 : 136,220.55 = 81,628.30 : x
  2. Step 2: Convert to fraction form
    90,813.70/136,220.55 = 81,628.30/x
  3. Step 3: Cross multiply
    90,813.70x = 136,220.55 × 81,628.30
  4. Step 4: Simplify right side
    90,813.70x = 11,119,451,921.57
  5. Step 5: Solve for x
    x = 11,119,451,921.57/90,813.70
  6. Step 6: Final answer
    x = 122,442.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.